User manual HANNA INSTRUMENTS HI 84430

[. . . ] Instruction Manual TOTAL ACIDITY MINITITRATOR & pH METER for Water Analysis HI 84430 w w w. This manual will provide you with the necessary information for the correct use of the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. This instrument is in compliance with directives. TABLE OF CONTENTS PRELIMINARY EXAMINATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 20 Check if the correct buffer has been used or regenerate the pH electrodes by following the Cleaning Procedure (see the "pH Cleaning Procedure" section). 21 · If the measured offset isn't within the preset limits the meter will display the message "Buffer Contaminated" alternatively with "Electrode Dirty/Broken". pH BUFFER TEMPERATURE DEPENDENCE The temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes to a lesser degree than normal solutions. During calibration the instrument will automatically calibrate to the pH value corresponding to the measured or set temperature. During calibration the instrument will display the pH buffer value at 25 °C. TEMP °C °F 32 41 50 59 68 77 86 95 104 1. 30 8. 48 8. 44 8. 41 8. 37 8. 33 8. 30 8. 27 8. 24 8. 21 · If the computed slope isn't within the preset limits the meter will display the message "Wrong Slope". If the slope is too low the symbol will be displayed. 0 5 10 15 20 25 · If the "Wrong Old Slope" error message is displayed, an inconsistency exists between the current and the previous (old) calibration. Clear the calibration parameters by pressing Clear and proceed with calibration from the current calibration point. The instrument will keep all the 30 35 40 confirmed values during the current calibration point. · If the temperature reading is out of the defined temperature range of the buffer (0 to 45°C) the "Wrong Buffer Temperature" error message will be displayed, and the symbol °C will blink on the display. 22 23 PUMP TUBE INSTALLATION To mount the new peristaltic pump tube set follow next steps: · Position one peristaltic pump fixing ring on its location. Note: Purge the peristaltic pump until drops of reagent appears on the dosing tip by pressing the PURGE key from the titrator main screen. To remove the tube of the peristaltic pump follow next steps: Caution: Purge line with water to remove titrant solution from tube. · Pull the tube until the fixing rings are taken out from their location. · Remove the other side of the tube. · Press CAL to access the titration calibration menu where electrode and pump calibration may be accessed. · Press Continue or ESC to skip the message and enter titrator main screen. · Press Purge to begin a purge cycle. PURGE Purging should be performed: · whenever the tube of the peristaltic pump is replaced; · whenever the titrant is changed or a new bottle of titrant is used; · before starting a pump calibration; · before starting a lot of titrations. In order to start purging press the Purge key from the titrator main screen. · From the instrument main screen (pH meter screen) press "Titrator" function key. The purging stops automatically after 5 minutes. To stop purging at any time and return to the main screen press ESC or Stop. During a purge, a countdown timer displays remaining time in 5 minute purge. · Press Pause or Stop (by pressing the corresponding function key in the purge screen) · after the first drops of fresh titrant appear at the dosing tip · in case an error condition is observed (empty titrant bottle, tubes or dosing tip disconnected, pump error) · if you want to resume at a later time If Pause is pressed the next screen is displayed: The instrument will display the next screen if tutorial is enabled and if any of the following conditions exist: - the meter hasn't been calibrated in 8. 30 pH buffer - the pH calibration has expired - a pump calibration hasn't been performed or more than 3 days have passed since the last pump calibration 24 Press Resume to continue purging. 25 After the 5 minutes purging interval has elapsed the "Completed" message is displayed. [. . . ] Replace the solution in the protective cap with a few drops of HI 70300 or HI 80300 Storage Solution. Note:NEVER STORE THE pH ELECTRODE IN DISTILLED OR DEIONIZED WATER. Rea d in g ou t of ra n g e. Th e m eter d oes n ot a ccep t th e p H b u ffer solu tion for ca lib ra tion . Broken p H electrod e. Rep la ce th e electrod e or con ta ct th e ven d or. Th e p u m p ca lib ra tion ca n 't b e p erform ed Broken p u m p tu b in g . Broken p H electrod e. Verify tu b in g is in ta ct a n d solu tion p a ssed wh en p u rg ed . Prep a re a n oth er sta n d a rd , p u rg e to h a ve fresh titra n t a n d resta rt th e ca lib ra tion . PERIODIC MAINTENANCE Inspect the electrodes and the cables. [. . . ]